African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6693

Full Length Research Paper

Assessment of selection techniques in genotype X environment interaction in cowpea Vigna unguiculata (L.) walp

Aremu, C. O.1 and O. J. Ariyo2 and Adewale, B. D.2
  1Department of Agronomy, LAUTECH, Ogbomoso, Nigeria 2Department of Plant Breeding and Seed Technology, University of Agriculture, Abeokuta, Nigeria.
Email: [email protected]

  •  Accepted: 11 April 2007
  •  Published: 31 August 2007



Ten genotypes of cowpea were grown in four environments comprising the early and late seasons of Ogbomoso and Abeokuta locations in 2005 and 2006. Joint linear regression analysis indicated the presence of Genotype x Environment interaction even though, a proportion was non-linear. The differences in the values of the regression coefficient and the correlation of grain yield revealed that the genotypes responded differently to the environments and that regression coefficient as a technique could not be used to identify genotype performance in specific locations. The use of Deviation mean square and Ecovalence mean square techniques produced similar results on the consistency of genotypes performance hence, Deviation mean square and Ecovalence mean square may not be simultaneously used. However, regression coefficient, Si3, Pi, and Modified rank sum techniques can be jointly used to select genotypes based on their yielding ability and response to environmental changes.


Key words:  Genotype X environment interaction, selection techniques, cowpea, Vigna unguiculata.